Right now, solar PV only has a few states where it has comparable grid costs as current grid costs…California, New Jersey, Hawaii, Pennsylvania to name a few. Why the limited adoption variation state to state? Utility base costs (Nuclear, Hydro, Wind, PV, Fossil fuels, Generators) and peak power technologies (Time of day consumption/tiered rate structures, Seasonal variables and Grid isolation) vary from state to state. Even with these variations, if solar PV had the same subsidies that all energy sources were afforded at their inception and are currently receiving under ongoing use, 100% of all US states would have solar PV at grid parity. Not possible you say? Consider the Germany example below. The US has 3900% more sunshine but Germany has 6000% more solar PV than the US…because they have the vision to see its value and subsidize its adoption. Other countries are doing the same as Germany (including China). Our energy policy needs to be rooted in something longer term than our politics and money interests.
Did you know that if the solar industry had the same subsidies that the fossil fuel industry has that it would have the same supply costs as current US electrical grid costs?